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June, 1951] 


Snodgrass: Anatomy 


71 


ANATOMY AND MORPHOLOGY 

By R. E. Snodgrass 

Collaborator, U. S. Bureau of Entomology 

In the vocabulary of zoologists, particularly of entomologists, 
the words “anatomy’’ and “morphology’* seem to have become 
synonymous, or nearly so, as applied to animal structure, except 
that “morphology” appears to be preferred probably as having 
a more impressive sound. In ordinary English, words mean 
what the speaker intends them to mean and the hearer under¬ 
stands ; many, probably most, of our everyday words now mean 
something quite different from what they originally did, just 
because we have come to use them as we do. Humpty Dumpty 
said to Alice, “When I use a word it means just what I 
choose it to mean,” and he had linguistic sanction on his side. 
“Anatomy” and “morphology,” however, are not ordinary 
English words, and the question is: can usage establish the 
meaning of scientific terms? Technical words must have a defi¬ 
nite meaning, they must be capable of specific definition, and 
they can be given a precise meaning only on a basis of their 
Latin and Greek origins. 

The term anatomy is formed of two Greek words that together 
mean “cutting up.” In its original sense “anatomy” is thus 
the same as the Latin c ‘ dissection. ’’ As with many other words, 
however, “anatomy” has expanded until its origin has been for¬ 
gotten, so that with us it now stands for the facts we learn by 
cutting up the animal, or also it designates the structure or 
even the tissue of the animal itself, whether dissected or not. 
“Anatomy” in its evolved sense is comparable to “venison.” 
Venator is the hunter, venatio is first the hunting of game, then 
the game animal itself, and finally, the flesh of the game becomes 
venison. “Game” has a similar transference from the sport of 
hunting to the animal hunted. So we may concede that 
“anatomy” has acquired its present meaning by perfectly legit¬ 
imate processes of word evolution. “Dissection,” on the other 
hand, is a conservative word that still means just what it did 


72 


New York Entomological Society 


[Vol. LIX 


when first coined, the cutting-apart of an animal for the study 
of its structure. Two words for the same thing being unneces¬ 
sary, “anatomy” has been promoted to fill a vacancy. 

The term morphology, according to its derivation, cannot pos¬ 
sibly be made synonymous with “anatomy.’’ Morphe is Greek 
for form, and as applied to an animal it refers to its structure, 
or anatomy, but the logy part of the word gives the term an 
abstract philosophical meaning . Logos is Greek for “word,” 
or a discourse in words, but words are expressions of ideas, and 
ideas may be right or they may be wrong. In either case, zoologi¬ 
cal morphology is simply what we think about the facts of 
anatomy; it is our philosophy about the form of animals. By 
contrast, anatomy is the concrete facts of structure. 

The difference between anatomy and morphology will be 
clearly perceived by listening to two anatomists or two mor¬ 
phologists discuss their respective subjects. The anatomists 
may disagree, but they have only to get a specimen and look at 
it until they both see it alike. Anatomy, in other wards, is capa¬ 
ble of demonstration. The morphologists, however, can argue 
interminably over theories and never, or hardly ever, come to 
the same conclusion. Of course, there is some chance that some, 
morphological ideas may conform with something true in the 
present or past of nature, but since most of them involve evolu¬ 
tion concepts, there is no way of putting them to a practical test. 
The very fact that our morphology can and does change with 
each generation of morphologists, while the anatomy of animals 
has not perceptibly changed during the memory of man is suffi¬ 
cient to show that the term “morphology” cannot be substituted 
for “anatomy.” 

We may now look at some of the literary results of confusing 
morphology with- anatomy. We often see entomological papers 
entitled “The External Morphology,” or “The Internal Mor¬ 
phology” of some insect. Even if such papers contain some 
morphological ideas, how can there be either an “external phi¬ 
losophy” or an “internal philosophy” of form? The philoso¬ 
phy is in the mind of the author, not in the insect under dis¬ 
cussion. Such papers might correctly be entitled, “Morphology 
of the External Structure,” or “Morphology of the Internal 



June, 1951] 


Snodgrass: Anatomy 


73 


Structure” of the insect, if they are truly morphological, but 
their contents often reveal that the subject matter is purely 
anatomical. 

In conclusion, for definitions the writer would submit to ento¬ 
mologists the following: 

Dissection (L. dis, apart; sectum, cut).—The cutting-apart 
of the animal to determine the facts of its structure. 

Anatomy (Gr. ana, up; tomos, cut).—The demonstrable facts 
of animal structure, or also, by transference to the object, the 
structure or even the tissue of the animal itself. 

Morphology (Gr. moiTphe, form; logos, word or discourse).— 
Our philosophy or science of animal form, a mental concept de¬ 
rived from evidence based on anatomy and embryogeny, usually 
incapable of proof, attempting to discover structural homologies 
and to explain how animal organization has come to be as it is. 

No suggestion is here offered as to what can be done about 
‘ ‘ physiology, ’ ’ which should mean the science of functional facts, 
but has to do duty also for the facts themselves. “ Embryology ” 
is more fortunate, since there is ‘‘embryogeny” or “embryo- 
genesis” to express the concrete facts of development; but again, 
microanatomy is commonly called the “histology” of the animal 
or its organs. However, because some words, for the lack of a 
complementary term, have to serve in two capacities is no excuse 
for confusing “morphology” with “anatomy.”